You can wear just about anything.
Just remember that elk only see in black and white, but if you are going to wear brand new clothes, go to Wal Mart and pick up some NO UV detergent. Wash them at least 2 times in this stuff to remove the phosphates in the clothing. Just make sure your clothing has some breakup so you are allowed at least some movement when the animals are in the area.
See phosphate to elk is like a flashlight to us, They see only black and white but the phosphate stands out ALOT more so it will be a darker black to a real light gray to them so they can spot you real easy.
Scent killer is another thing I would recommend.
Good luck on your hunt!
-Cass